Evidence map›Paper›PMID 34918097›Full record

ReviewJournal of travel medicine2022

Heterologous prime-boost strategies for COVID-19 vaccines.

Binaya Sapkota, Bhuvan Saud, Ranish Shrestha, Dhurgham Al-Fahad, Ranjit Sah, Sunil Shrestha, Alfonso J Rodriguez-Morales

Abstract readReview
In one paragraph

Review in Journal of travel medicine, 2022. The graph could read no effect estimate from its abstract, so it casts no vote on the map. Cited by 64 papers.

0numbers the graph read from it
0cells of the map it votes in
64citing papers in PubMed
–field-weighted citation impact
1 · What the graph read from it

What it found

Each row is one number read from the abstract, on the scale the paper reported it, with its interval. Left of the dashed line favours the treatment, right favours the comparator. Under each row is the sentence it came from. New to these charts? A ten-minute tutorial.

The abstract states no effect estimate the extractor could read, or names no intervention and outcome on the map, so this paper lights no cell and moves no belief. It is still indexed, cited and linked below.

2 · The registry

The trial behind it

Trials whose registry record cites this paper, or whose number appears in the abstract. A trial that started after this paper was published is citing it as background, not reporting it.

Neither the registry nor the abstract names a trial number. If this is a trial report, that itself is worth knowing.

3 · Its place in the literature

Who cites it

64 citing papers in PubMed.

  1. Article
  2. Article
  3. Article
  4. Article
  5. Cellular Immunological Memory T Cells andDiagnostics (Basel, Switzerland) · 2025
    Article
  6. Article
  7. Review
  8. Article
  9. Hybrid Immunity in a Mozambican Cohort After 1 or 2 Doses of the BBIBP-CorV Vaccine.Clinical infectious diseases : an official publication of the Infectious Diseases Society of America · 2025
    Article
  10. Article
  11. Effect of heterologous intranasal iNCOVACCCommunications medicine · 2025
    Article
  12. Review
  13. Article
  14. Article
  15. Article
  16. Article
  17. Article
  18. Article
  19. Article
  20. Article

4 more citing papers are in PubMed but not listed here.

4 · The record

Corrections and comments

PubMed lists nothing against this paper. Absence here is not a guarantee, only a check that was made.

5 · Who and what money

Authors and funding

7 authors.

Binaya SapkotaNobel College Faculty of Health Sciences, Department of Pharmaceutical Sciences, Kathmandu, Nepal.ORCID 0000-0002-4125-9866
Bhuvan SaudDepartment of Medical Laboratory Technology, Janamaitri Foundation Institute of Health Sciences, Lalitpur, Nepal.ORCID 0000-0002-3030-3382
Ranish ShresthaInfection Control Unit, Outbreak Investigation and Response Sub-committee, Nepal Cancer Hospital and Research Center, Lalitpur, Nepal.ORCID 0000-0002-0137-1888
Dhurgham Al-FahadDepartment of Pathological Analysis, College of Science, University of Thi-Qar, Thi-Qar, Iraq.ORCID 0000-0001-6027-6656
Ranjit SahTribhuvan University Teaching Hospital, Institute of Medicine, Kathmandu, Nepal.ORCID 0000-0002-2695-8714
Sunil ShresthaSchool of Pharmacy, Monash University Malaysia, Selangor, Malaysia.ORCID 0000-0002-9174-7120
Alfonso J Rodriguez-MoralesGrupo de Investigación Biomedicina, Faculty of Medicine, Fundacion Universitaria Autonoma de las Americas, Pereira, Colombia.ORCID 0000-0001-9773-2192

Funding

No grant is acknowledged in the PubMed record.

6 · The paper itself

Abstract

BACKGROUND/

objectiveHeterologous prime-boost doses of COVID-19 vaccines ('mix-and-match' approach) are being studied to test for the effectiveness of Oxford (AZD1222), Pfizer (BNT162b2), Moderna (mRNA-1273) and Novavax (NVX-CoV2373) vaccines for COVID in 'Com-Cov2 trial' in UK, and that of Oxford and Pfizer vaccines in 'CombivacS trial' in Spain. Later, other heterologous combinations of CoronaVac (DB15806), Janssen (JNJ-78436735), CanSino (AD5-nCOV) and other were also being trialled to explore their effectiveness. Previously, such a strategy was deployed for HIV, Ebola virus, malaria, tuberculosis, influenza and hepatitis B to develop the artificial acquired active immunity. The present review explores the science behind such an approach for candidate COVID-19 vaccines developed using 11 different platforms approved by the World Health Organization.

methodsThe candidate vaccines' pharmaceutical parameters (e.g. platforms, number needed to vaccinate and intervals, adjuvanted status, excipients and preservatives added, efficacy and effectiveness, vaccine adverse events, and boosters), and clinical aspects must be analysed for the mix-and-match approach. Results prime-boost trials showed safety, effectiveness, higher systemic reactogenicity, well tolerability with improved immunogenicity, and flexibility profiles for future vaccinations, especially during acute and global shortages, compared to the homologous counterparts.

conclusionStill, large controlled trials are warranted to address challenging variants of concerns including Omicron and other, and to generalize the effectiveness of the approach in regular as well as emergency use during vaccine scarcity.

Indexed as

COVID-19COVID-19 VaccinesAd26COVS1BNT162 VaccineChAdOx1 nCoV-19HumansImmunogenicity, VaccineSARS-CoV-2Ad26COVS1BNT162 VaccineChAdOx1 nCoV-19COVID-19 VaccinesNVX-CoV2373 adjuvated lipid nanoparticleCOVID-19heterologous prime–boostmix-and-matchSARS-CoV-2vaccinationvaccine

Identifiers

PMID34918097
PMCPMC8754745

What OpenQuestion holds

Textmetadata
Read underepoch 390

Registered trials

None linked

Read under generation 80e0d062 · epoch 390. Bibliography from PubMed, PubMed Central and OpenAlex; grants from NIH RePORTER; trial links from ClinicalTrials.gov; estimates, votes and beliefs from the OpenQuestion graph.